Kill jobs which are currently running on the batch system.
In case of an error when killing, the function tries - after a short sleep - to kill the remaining batch jobs again. If this fails three times for some jobs, the function gives up. Jobs that could be successfully killed are reset in the Registry.
killJobs(ids = NULL, reg = getDefaultRegistry())
data.table] with columns “job.id”, the corresponding “batch.id” and
the logical flag “killed” indicating success.